2010/10/2 paul stenquist <pnstenqu...@comcast.net>: > > What's DC?
Direct Current AF motor. There was a mail here some time ago linking to the patent document. Simple, robust looking design. > Have you had trouble with an SDM lens, Ecke? I know Robb and Celio did. Has > anyone else on the list had a failure? I'm genuinely curious. yes I have. my DA*16-50 was both repaired and replaced under warranty following two SDM motor failures. my current copy was acting up once very briefly in sub zero temperatures but has been peaceful otherwise. I hope it stays that way. as to the "less use" theory expressed by some people, I was an accessory to that, it was my gut feeling also and I also read it from other people. nothing to substantiate that feeling. someone said the grease might go sticky. I passed it on in here with a pinch of salt or two. there was also a belief expressed by some that the problem was limited to the SDM+screw lenses but I have no knowledge of how likely that idea is to be accurate or applicable. I doubt it somewhat. I've had a Canon body's mirror brake (for lack of a better word) go sticky from lack of use though, apparently a common issue known as "Canon Asthma" in these parts -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
